process of bauxite mining machinery

Mining and Refining – Process - World Aluminium
The Bayer Process was invented and patented in 1887 by Austrian scientist Karl Josef Bayer. Two to three tonnes of bauxite are required to produce one tonne of alumina. 90% of the global alumina supply of around 90 million tonnes is used in aluminium production.
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Mining and Refining – Process - World Aluminium
Bauxite is generally extracted by open cast mining, being almost always found near the surface, with processes that vary slightly depending on the location. Before mining can commence the land needs to be cleared of timber and vegetation.
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May 08, 2014· PROCESS DESCRIPTION: BAUXITE MINING. Bauxite is the principal ore of alumina (Al 2 O 3), which is used to produce aluminum (Al).It is composed of hydrated aluminum oxides, hydrated aluminosilicates, iron oxides, hydrated iron oxides, titanium oxide, and silica.
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In 2006, three out of 14 plants beneficiated the bauxite at a local washing plant and two operations dried its bauxite before shipping. After mining, the bauxite is refined into alumina using the Bayer process (refining). The majority of the alumina is then transformed into aluminium using the Hall/Heroult electrolytic process (smelting).
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In Guinea, foreign mining companies have traditionally extracted bauxite using their own workers and their own machinery, giving little back to local communities in terms of employment.
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The top supplying countries are China (Mainland), Iran (Islamic Republic of), and South Africa, which supply 98%, 1%, and 1% of bauxite calcination process respectively. Bauxite calcination process products are most popular in Domestic Market, North America, and Eastern Asia.
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Once the Bayer Process was developed, the aluminum mining process became more expeditious. But advancements in mining equipment over the last several years have made the work of extracting bauxite even more efficient for mining companies around the world.